Effect of Cr2O3 content on viscosity and phase structure of chromium-containing high-titanium blast furnace slag

For several years, ordinary vanadium-titanium magnetite has been rapidly consumed because of its use in smelting. Thus, sources of chromium-containing vanadium-titanium magnetite will need to be developed and utilized in the future. Therefore, the physical and chemical properties of the blast furnace slag that results from smelting chromium-containing vanadium-titanium magnetite should be completely understood. In the present work, the viscous flow characteristics of CaO-SiO2-MgO-TiO2-Al2O3-Cr2O3 system slag were investigated both theoretically and experimentally to promote a better understanding of the effect of Cr2O3 addition on the viscous behavior of slag. With increasing Cr2O3 content, the viscosity first decreases and then increases. When the Cr2O3 content is a maximum of 0.5 wt.%, Cr2O3 serves as a network modifier to simplify the slag structure and reduce the viscosity. When the added amount was a minimum of 1.5 wt.%, perovskite and spinel phases were formed in the slag, resulting in increased viscosity. (C) 2020 The Authors. Published by Elsevier B.V.